Customs and Border Protection may pick several winners, or none.
Contracts to build prototypes for the final wall were handed out earlier this year, and construction has begun in San Diego.
Bidding documents say four of the eight prototypes are to be solid concrete and four are to be made of "other materials". Four of them will be built of concrete, and the rest from alternative materials.
CBP unveiled the companies selected to construct the prototypes late last month.More news: New Zealand Starts Counting Votes in Too-Close-To-Call Election
With an expectation for protests and demonstrations in response to the border wall construction, county officials unanimously approved the urgency ordinance, which takes effect immediately. "First, given their robust physical characteristics - for example, they will be between 18 and 30 feet high - the "other materials" border-wall prototypes are created to deter illegal crossings in the area in which they are constructed".
The issue of who's footing the bill for the wall has proved to be an area of contention between the US and Mexico, as President Trump has repeatedly called on Mexican President Enrique Pena Nieto to commit to sharing the costs of his "big, beautiful" wall. "We're spending a tremendous amount of money and we're going to have that". "The new designs would be added to our menu of existing designs, and allow us to tailor a specific wall design to the unique demands of individual areas of the border". "So you need to have a great wall - but it needs to be see-through". As a result, Senate Republicans shifted Trump's ambitions to construct a multibillion-dollar wall and instead considered a plan to improve border security through infrastructure, technology and enforcement.
In nearby streets, signs have been posted prohibiting vehicles from parking there between September 26 and November 10.
The prototypes are created to test out new approaches, materials, strategies and technology as Homeland Security pushes forward with Mr. Trump's goal of a border wall. "There is no funding for it in Congress", Hiram Soto, spokesman for the activist group Alliance San Diego, told Los Angeles Times.